Improper Neutralization of Script-Related HTML Tags in a Web Page (Basic XSS) in Hestia Control Panel - #VU140564
Published: July 30, 2026
Vulnerability identifier: #VU140564
CSH Severity: Low
CVSS v4: 6.9 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:A/VC:L/VI:H/VA:N/SC:N/SI:N/SA:N]
CVE-ID: N/A
CWE-ID: CWE-80
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote user to execute arbitrary JavaScript in an administrator's browser.
The vulnerability exists due to improper neutralization of script-related html content in the notification panel rendering in web/templates/includes/panel.php when rendering stored notification content through x-html. A remote user can create a crafted notification to execute arbitrary JavaScript in an administrator's browser.
User interaction is required because an administrator must view the affected user's notifications, such as during impersonation of a non-admin account.
Affected software
Hestia Control Panel
Remediation
Install security update from vendor's website.
Hestia Control Panel - update to 1.9.8